Three problems related to engine noise have been reported for the 2007 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Toyota Sienna based on all problems reported for the 2007 Sienna.
Was driving vehicle on freeway at 70 mph when engine noise started. I soon noticed the check engine light and the oil pressure light was on and stopped the van. Added more oil and restarted the van. I then investigated and found oil leaking out of a ruptured rubber oil cooler hose. I lost nearly 6 quarts of oil that had been pumped out on the highway. (possibly causing a traffic hazard to other drivers) towed van to dealer and had to pay over $250. 00 for repairs to the oil cooler lines. New lines are now all metal lines. Dealer refuses to accept any responsibility for possible engine damage.
On March 12. 2010 I was traveling to arches national park with four other passengers. On the way, we decided to stop by bryce canyon utah. I was driving a 2007 Toyota Sienna through 26 s. Main street bryce canyon city. Because of bad weather condition. I had put the car in gear 3 and was driving 5 miles per hour. Suddenly I heard the engine accelerate and felt the car push forward. I let off the accelerator and cautiously pressed the brakes as hard as I could, but brakes did not respond and the car continued forward about 150 feet. Somehow I managed to turn right on center street and bumped onto the curb to be able to stop the car. After the car came to full stop, the engine sounded normal. Because of this incident, we changed our schedule and returned home.
2007 Toyota Sienna made a pinging sound when first starting the vehicle. Consumer states that the dealer stated that this is normal when the engine was cold. Dealer called it a piston slap. Finally dealer stated the vehicle had a problem.